001/*
002 * Copyright (c) 2007-2015 Concurrent, Inc. All Rights Reserved.
003 *
004 * Project and contact information: http://www.cascading.org/
005 *
006 * This file is part of the Cascading project.
007 *
008 * Licensed under the Apache License, Version 2.0 (the "License");
009 * you may not use this file except in compliance with the License.
010 * You may obtain a copy of the License at
011 *
012 *     http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing, software
015 * distributed under the License is distributed on an "AS IS" BASIS,
016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017 * See the License for the specific language governing permissions and
018 * limitations under the License.
019 */
020
021package cascading.flow.hadoop.stream.element;
022
023import cascading.flow.FlowProcess;
024import cascading.flow.hadoop.HadoopCoGroupClosure;
025import cascading.flow.hadoop.HadoopFlowProcess;
026import cascading.flow.hadoop.stream.HadoopGroupGate;
027import cascading.flow.stream.duct.Duct;
028import cascading.flow.stream.graph.IORole;
029import cascading.flow.stream.graph.StreamGraph;
030import cascading.pipe.CoGroup;
031import cascading.tuple.Tuple;
032import cascading.tuple.io.IndexTuple;
033import org.apache.hadoop.mapred.OutputCollector;
034
035/**
036 *
037 */
038public class HadoopCoGroupGate extends HadoopGroupGate
039  {
040  public HadoopCoGroupGate( FlowProcess flowProcess, CoGroup coGroup, IORole role )
041    {
042    super( flowProcess, coGroup, role );
043    }
044
045  @Override
046  public void bind( StreamGraph streamGraph )
047    {
048    super.bind( streamGraph );
049    }
050
051  @Override
052  protected HadoopCoGroupClosure createClosure()
053    {
054    return new HadoopCoGroupClosure( flowProcess, splice.getNumSelfJoins(), keyFields, valuesFields );
055    }
056
057  @Override
058  protected void wrapGroupingAndCollect( Duct previous, Tuple valuesTuple, Tuple groupKey ) throws java.io.IOException
059    {
060    Integer ordinal = ordinalMap.get( previous );
061
062    collector.collect( new IndexTuple( ordinal, groupKey ), new IndexTuple( ordinal, valuesTuple ) );
063    }
064
065  @Override
066  protected Tuple unwrapGrouping( Tuple key )
067    {
068    return ( (IndexTuple) key ).getTuple();
069    }
070
071  protected OutputCollector createOutputCollector()
072    {
073    return ( (HadoopFlowProcess) flowProcess ).getOutputCollector();
074    }
075  }